; Exercise 3.49.
;
; Give a scenario where the deadlock-avoidance mechanism
; described above does not work. (Hint: In the exchange problem, each
; process knows in advance which accounts it will need to get access to.
; Consider a situation where a process must get access to some shared
; resources before it can know which additional shared resources it will
; require.)
; ------------------------------------------------------------

; brainstorming problem. There are various ways to think of it and to
; find lot of ways it will not work.
